Comparing FPGAs from different manufacturers and different families is quite tricky as what makes up a “slice” is not the same across all of them, and in newer families LUTs have more inputs.
From what I’ve read, the best metric for comparing capacity is Logic cells/ logic elements, followed by Block RAM.
This was my quick and dirty attempt at comparing the different boards/ FPGAs
Board | LOGi & Papilio Pro | Papilio One | Nexys | Basys 3 | Cheap eBay board | Terasic DE1 |
---|---|---|---|---|---|---|
Device | XC6SLX9 | XC3S500E | XC3S1000 | XC7A35T | EP2C5 | EP2C20 |
Logic cells | 9152 | 10476 | 17280 | 33280 | 4608 | 18752 |
Distributed RAM | 90kb | 73kb | 120kb | 400kb | 117kb | |
Block RAM | 576kb | 360kb | 432kb | 1800kb | 104kb |